Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d92fa2fe4be23e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 01:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 151d8045c43853ef6484e7f8cafb28bd SHA-1: 40b2331afa0c78e7f8ee2ae2eed5387e5f37924a SHA-256: 12d92fa2fe4be23e1b7dc3c6fc03dbd51808bf1de3bb3809446951409bfb4a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, a common tactic for distributing malicious content or conducting phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/iqfpqfhst89t4c4gr9lvj2h0ab/6452496881.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8c84e0f4a2b8670caee75dd4f0530d0f/fegisajosoluwotatij.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/nijadositonofapowem.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf77abfca9---51930097404.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dadebovewa.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/xakikorutuxukap.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/mofif.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afea2d4323---32768706522.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/gabudigixupibomu.pdfIn PDF document text
    • http://planbmedia.hu/files/jizevorajerabumodado.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/46ef1f99417f985b90ba41c1d83da0ac/bosajomilug.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a02593a5d77---zujap.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mevufupidirujumolewonaz.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/66721249619.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c608e1c8682---gafokanafotefatitod.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/dodatagafixuvi.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/69457209720.pdfIn PDF document text
    • http://coffee33.ru/archive/file/30460004619.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/54403538148.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/lixufunor.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/musuvepupixisafokufapawi.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/10256743069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fast+exercise+michael+mosley+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 15948 bytes
SHA-256: fdbd0c7ee8df66c9afd58a0291f2415a0403430be2f7117cf40fac3be33241b1
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10972 bytes
SHA-256: 04e6d3b91b679519e4dff423d62cc3913272f03ad282a5cc5d1868814b1a095e
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1